Question

What’s the “best” method to supply a statement with mutliple parameters? I want to insert a single line into an SQLite database.

Adapting https://developer.mozilla.org/en/Storage#Binding_Parameters I thought the following would work:

var conn = Services.storage.openDatabase(dbfile); // Will also create the file if it does not exist
let statement  = conn.createStatement("INSERT INTO persons (name, email, city) VALUES (:name, :email, :city)");
statement.params.name = myName;
statement.params.email = myEmail;
statement.params.city = myCity;

But obviously I can’t even create the statement itself:

Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [mozIStorageConnection.createStatement]

After that I’d like to execute it asynchronously…

Answer 1

There is nothing wrong with the code you show here – it works correctly. However, createStatement will validate the SQL code and throw an NS_ERROR_FAILURE error if that code is invalid. In your case either the table persons doesn’t exist or not all of the fields name, email and city exist in it. You should take a look at the lastErrorString attribute to see the error message:

let statement = null;
try
{
  statement = conn.createStatement("INSERT INTO persons (name, email, city) VALUES (:name, :email, :city)");
}
catch (e)
{
  Components.utils.reportError(conn.lastErrorString);
}